Patent US3511394A successfully refreshed from Google Patents.
Patent US3630853A successfully refreshed from Google Patents.
US3630853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coke oven door with fluid pressure latching means
Assignee: Dr C Otto and Co GmbH
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Filing: 1969-11-19
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Granted: 1971-12-28
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Expires: 1989-11-19
Abstract
Abstract A coke oven door which has upper and lower fluid filled diaphragm means acting on door latches and also has intermediate fluid filled diaphragm means continuously communicating with said upper and lower diaphragm means and normally subjected to pressure by a force while means associated with said door are provided which in response to a limited upward movement of a lifter hook movably connected to said door automatically causes said force to reduce the pressure exerted thereby upon said second diaphragm means and thereby upon said first diaphragm means so that the door latches are relieved for permitting lifting the door off the oven frame.
Inventors
- 👤 Walter Grumm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:16
CPC Classifications
C; C10; C10B; C10B25/00; C10B25/02; C10B25/08; C10B25/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
83 words
An arrangement according to claim 1, in which said pressure exerting means is formed by pressure spring means having its axis substantially perpendicular to said base plate, and which includes plate means operatively connected to said second linkage means and operable in response to an upward movement of said lifter hook means to compress said spring means in a direction away from said second chamber means to thereby reduce the spring pressure exerted by said spring means on said second lifter hook means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |